Problem 1: Basic Principle
A proportional valve is controlled by the driving current of its proportional electromagnet. The current determines electromagnetic force, which regulates spool position and valve port opening to achieve proportional flow control. The controller converts upper-level commands into stable driving current.
The controller is driven by standard industrial field signals (typically 0-5V, 0-10V, 0-20mA, or 4-20mA) to proportionally adjust the driving current of the valve body (solenoid).Example: If a controller has a 0-5V input and a maximum 1A output current, a detected 4V (80% of range) control signal will cause the controller to activate and output 0.8A (80% of range) current to the proportional valve. The resulting flow rate can then be determined by referencing the proportional valve's technical specifications.
Problem 2: Common Solenoid Valve vs. Proportional Solenoid Valve
Conventional solenoids provide only ON/OFF (full flow or no flow) switching, whereas proportional solenoids allow for continuous and precise regulation of flow or pressure based on the command signal.
| Type | Function | Control Methods | ||||
| Solenoid Valve | Only has two states (open/closed), presenting as on and off externally. | Activates when powered on; stops when power is cut off. | ||||
| Proportional Valve | Can continuously and proportionally adjust opening, and control fluid pressure and flow. | Controls the proportional valve's opening via continuously adjustable current. | ||||
Problem 3: How to Use the Controller
Since conventional industrial equipment only provides a fixed voltage source (e.g., 24V DC) and no adjustable current source, a proportional valve controller is required when using the proportional valve, or you can design a dedicated proportional valve control circuit yourself to supply a stable driving current to the valve.
If you purchased our brand of proportional solenoid valve, you can buy our matching controller as needed. If you need to select a controller for a proportional valve of another brand you already have, our controllers are compatible with some models of certain brands (you can send details such as the valve brand, model, and specific requirements to customer service for consultation).
How to Use the U.S. Solid Brand Controller
- Two black leads connect to the valve (the leads are connected to the junction box, which is then connected to the valve).
- The red (positive power supply) and blue (negative power supply) leads connect to a fixed power source.
- The white (positive signal) and yellow (negative signal) leads are used to connect the input signal.
- For controller selection, it is recommended to consult customer service before purchasing.
Problem 4: Other Questions
The controller is a critical component for using proportional valves. Whether purchasing it to match our valves or to work with your non-brand valves, ensure full understanding before ordering. For non-brand valve compatibility, consult customer service in advance to avoid mismatches.